Moderate fluid percussion injury (FPI) augments seizure severity.
Early post-traumatic seizures exacerbate consequent seizure severity.
Prophylactic Levetiracetam reduces post-FPI seizure severity.
Early post-FPI seizures enhanced post-seizure hippocampal CA1 neuron loss.
Levetiracetam reduces hippocampal neuron loss after early post-FPI seizure.